Hopper for producing cellulose plates and films.



J. -E.' BRANDENBERGER. HOPPER FOR PBODUOING UELLULOSE PLATES AND FILMS.

r m m MM 7 0 m Wm m L f a d M2. QM w h n m H B. mm P APPLICATION FILED HA3 4, 1912.

UNITED STATES PATENT FFICE.

JAQUES EDWIN BRANDENBERGER, THAON-LES-VOSGES, FRANCE.

HOPPER FOR PRODUCING CELIiULOSE PLA'JZES AND FILMS.

Specification of Letters Patent.

Patented Jan. 7,1913.

Application filed March4,1912. Ser'ia1No.681,514. I 1

To all 'uihom it may concern:

Be it known that I, JAQUES EDWIN BRAN- DENIBERGER, a citizen of the Republic of- Switzerland, and resident of' Thaon-les- Vosges, France, have invented new and useful Improvements in or Relating to Hoppers for Producing Cellulose Plates and Fihns, which improvements are fully set forth in the following specification.

In the manufacture of cellulose plates and films the hopper usually employed is merely a receptacle open to the atmosphere and having the shape of a triangular prism arranged horizontally above the coagulation bath, the lower edge of which receptacle is slotted for afiording passage to the layer of aqueous cellulose solution stored in the receptacle. Such hopper has, however, certain disadvantages: Air is in contact with the cellulose solution, which results in a quick alteration of the latter, dust and for eign substances are liable to fall into the said solution, and air bubbles are liable to form at the moment of filling, etc.

This invention comprehends the use in the manufacture of cellulose plates and films, in place. of the usual hopper, of a tubular receptacle with forced feed which has the following advantages over the ordinary hopper: 1. Impossibility of contact of the air, with the cellulose solution owing to the forced filling of the receptacle, with consequent preservation, without possibility of alteration, of the solution during a considerable time. 2. Impossibility ofpenetration into the cellulose solution of dust j and foreign substances which are the cause of defects in the manufactured product.

3Q Impossibility of formation 'of air bub-1 bles during the filling of the receptacle. A.

Possibility of a mathematical accuracy inthe construction of the slot, owing to. the' mechanically rational construction of the walls. 5. Possibility of examination of the lips of the orifice and facilitation of the 'startin of the plates and films at the beginningo the-spinning by reason .of the mo-vable mounting of the hopper.

In order to make the following, explanations as clear as possible, the accompanying drawings show by way of example the tubular receptacle forming the subject-mat ter of the invention. Flgure 1 1s a longitudinal section of the improved hopper taken on line AA of Fig. 2, and Fig. 2 is a cross-section on line B-B of Fig. -1.

The hopper a in question has the shape vided with pivot pins d which rotate in suitable bearings and enable the slot b to be quickly brought out of the coagulation bath and plunged back intovit. A branch 6 to which is connected a conduit f, enables the receptacle to be filled with the aqueous solu- ,tion of cellulose under a suitable pressure.

This. apparatus facilitates the starting owing to the possibility of turning it to a predetermmed angle about a horizontal axis.

Moreover, this movement enables the longitudinal edges of the slot 6 to be examined and attended to.

" Having now particularly described and ascertained the nature of my said inventionand in what manner the same isto-be per-' formed, I' declare that what I claim, is

- A hopper for use in obtaining cellulose plates and'films comprising a cylindrical tube splitalong one of its generatrlces and mounted for rotatable movement about an axis parallel to said generatrices.

' In testimony whereof I have signed this specification in the presence of two subscribing witnesses. p "JAQIIES EDWIN BRANDENBERGER. 1 Witnesses; T EMILE LEDRET, LUomNME- MINoER. 

